Demountable rotary crusher



May 13, 1930. C.M. STEIN 1,

DEMOUNTABLE ROTARY CRUSHER Filed March 18, 1925 I/v VEA/m i.

'm i 23y Patented May 13, 1930 UNITED STATES PATENT orrlcr.

CHARLES H. STEIN, OF PARIS, FRANCE, ASSIGNOR T0 SOCIETE ANONYME LA COM.- BUSTION RATIONNELLE, OF PARIS, FRANCE, A CORPORATION OF FRANCE DEMOUNTABLE ROTARY causnna Application filed March 18, 1925, Serial No. 16,586, and in France January 5, 1925.

The invention has for its subject matter a number of arrangements which permit of ensuring, by simple means, the driving of the motor shaft of a Wheel or disc carrying the working elements of a rotary pulverizer. One of the objects of the invention is the provision of means facilitatingthe act of demounting and replacing the crushing wheel in one operation or in a small number of operations. At the same time these arrangements ensure efiicient protection to the motor shaft against excessive resistance borne by the crushing elements. Other objects of the invention will be made apparent in thefollowing specification, when read in connection with the accompanying drawings forming a part thereof.

In order to realize these objects consideration is first given to an arrangement shown in Figures 1 and 2 in the annexed drawings. In said drawings:

Figure 1 is a longitudinal section through the axis of the motor shaft.

Figure 2 is an end elevation.

Fig. 3 is a view similar to Fig. 1, showing a modified form of the invention, and,

Fig. 4 is a similiar view of another modification.

On the figures, 1 is the motor shaft which drives at its end the crushing apparatus. 2 is a hub keyed at 3 on the shaft and abutting against the shoulder 4 on the said shaft. The hub 2 is provided on its periphery with a number of recesses 5, generally three. The hub 2 is extended to form a cylindrical sleeve 6 on which is exactly centered the corresponding core of the disc 7 carrying the crushing elements, the said core being of conical forma tion externally. The disc 7 of the pulverizer is provided in accordance with the hub 2 with a similar number of holes as the said hub, but the said holes are of smaller diameter. Bolts 9 are equivalent of two different diameters and of a number corresponding to that of the holes, are clamped against the disc 7 by a nut and lock nut so that the larger diameter parts of the bolts form axes which are enclosed without play in hard steel sockets 5 mounted on the driving hub 2. From approximately the end of the key seat on the shaft 1 the latter is reduced in diameter and is screw threaded, the pitch of the said screw being of a fine nature. A nut.10 is adapted to screw onto the fine threaded part of the shaft 1 and the direction of the thread there-v on is such that the nut by its inertia has a tendency to lock or jam itself during the rotation of the shaft 1. The outer end of the nut is provided with a recessof square, hexagonal or other suitable form so as to allow of the insertion'of the key to effect removal of the nut. On the face opposed to the nut 10 is provided a circular recess 12 and the outer face of this recess is turned conical as shown at 8 with a slope corresponding to the slope on the external surface of the cylindrical extension 6 on the hub 2.

It is clear from the foregoing that at or about the end of the operation of screwing the nut 10 onto thescrew threaded end of the shaft 1, the interior cone of the nut will come gradually ,into contact with the cone on the hub and that on this contact being effected, a slight additional effort on the key .will ensure definite clamping or locking by wedging of the two conical surfaces one into the other. I

It is obvious that by positioning the single nut 10 or by demounting it, the crusher wheel 7 is consequently retained in position or released, the bolts 9 being thereby released from their sockets.

The small section of the bolts 9, their nummum play is provided at 13 between the face of the nut 10 when screwed home and the disc 7 in order to avoid direct clamping of the disc 7 on the hub 2, such clamping being liable to cause driving of the crusher after rupture of the safety bolts 9.

Figure 3 shows in longitudinal section a 100 constructional modification in accordance with the present invention. In this figure,

14 is the main shaft which is provided with a shoulder 15 which is rigid with the shaft and formed by awasher attached thereto. The shaft 1-1 is provided with a screw threaded end 16 the said thread being of fine pitch. The disc 17 of'the crusher wheel is connected to the hub 18 by bolts 19,. the number and section of the said bolts being predetermined to meet the requirements of the machine in a similar manner to the bolts 9. Either type of safety bolt may be employed that is to say, the stud bolt shown at 9 in Fi ure 1 or The hub 18 is screw threaded to agree with Such set screw acts to'oppose unclamping ofthe hub by reason of the difference in pitch of the set screw thread and of the screw thread on the hub 18 and the part 16 of the 20 shaft. The screw threaded part 16 and the screw thread 21 are preferably of opposite direction so as to prevent unclamping of the cooperating parts. It'will be seen that on unscrewing the set screw 21 it is suflicient to turn the screw 16 in the desired direction inorder to unscrew the hub 18 and the shaft is; then ready to receive an interchangeable wheel or disc such as 17 which can be placed in position by reversing the operation hereinbefore described. Figure 4 shows in longitudinal section a further constructional form in accordance with the invention. The motor shaft 22 is provided with a ring 23 and an end 24 hav- 6 The hub 26 which is driven 'by the key 25 cannot be displaced along the shaft because of the presence of a pin 28 situated in a hole 29 in the shaft end 24,,the end of which pin engages in a correspondinghole in the hub 26. A spring 30 is provided which bears at one end on a plug 31 and at the other end on an enlarged portion of the pin 28 and there- ,by ensures the engagement of the pin 28 in the corresponding hole in the hub 26 so that accidental displacementof the pin 28 is impossible.

In order to demount it, it is sufficient to disengage the pin 28 from the hole in the hub 26 and to slide the hub from the shaft, the latter being then ready to receive another the ordinary bolt shown at 19, ligure 3.

the hub and the crusher, and 'means for preventing axial displacement of the hub on the shaft.

2. In the structure defined in "claim 1, the axial displacement preventing means includ ing a spring pressed pin mounted in the shaft and an opening in the hub for normally receiving said pin for preventing axial movement of the hub.

In testimony whereof I atlix my signature.

CHARLES M. STETN. 

